電解加強分散性奈米鈀/鐵金屬反應牆還原結合過硫酸鹽氧化水中三氯乙烯之研究-砂箱測試

Electolysis-Enhanced Dispersed Nano Pd/Fe Bimetallic Particles Reduction Coupled with Persulfate Oxidation of Trichloroethylene from Groundwater - A Sandbox Test

陳弘傑(Hong-Jie Chen)

指導教授 ： 黃益助

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2015年)

https://doi.org/10.6346/NPUST.2015.00185

摘要

摘要
學號：M10231020
論文名稱：電解加強分散性奈米鈀/鐵金屬反應牆還原結合過硫酸鹽氧化水中三氯乙烯之研究-砂箱測試
總頁數：152
學校名稱：國立屏東科技大學 系(所)別：環境工程與科學系碩士班
畢業年月：104年7月 學位別：碩士學位
研究生：陳弘傑 指導教授：黃益助
論文摘要內容：
本研究利用砂箱進行電解加強分散性奈米鈀/鐵金屬反應牆還原結合過硫酸鹽氧化水中三氯乙烯(trichloroethylene, TCE)之降解實驗。實驗架構主要分成五個部分：(1)進行奈米鐵顆粒、奈米鈀/鐵及分散性奈米鈀/鐵基本特性分析；(2)供試水基本性質分析及石英砂吸附TCE 實驗；(3)多孔介質傳輸實驗；(4)電解加強分散性奈米鈀/鐵懸浮液反應牆降解TCE 實驗；(5)電解加強分散性奈米鈀/鐵懸浮液反應牆還原結合過硫酸鹽氧化降解水中TCE 實驗。
利用比表面積儀測定分散性奈米鈀/鐵(1：1000)顆粒之平均比表面積為167 m2/g，另利用X 光折射儀(X-ray powder diffraction, XRD)分析奈米鈀/鐵顆粒，於2θ = 44.980和650皆有鐵金屬之反應，鈀金屬則是於2θ = 27.450與31.880；另利用傅利葉紅外線光譜儀(Fourier Transform Infrared Spectrometry, FTIR)鑑定分散性奈米鈀/鐵顆粒，發現顆粒上存在有鐵金屬還原TCE所產生之烯類。

分散性奈米鈀/鐵還原TCE 實驗中，呈現pH 上升、氧化還原電位下降之情形；還原過程中氯離子產生量與TCE 削減量呈現正比關係。使用過硫酸鹽氧化TCE 實驗中，實驗結果顯示分散性奈米鈀/鐵於還原TCE 過程中產生亞鐵離子，能活化過硫酸鹽成硫酸鹽自由基(SO4-･)進而氧化TCE。在電解加強反應牆實驗中，電壓梯度為2 V/cm 比1 V/cm 對TCE降解效果好，當電壓梯度為2 V/cm，實驗過程中發 現反應牆內易生成沉澱物且因放熱產生大量氣泡造成TCE 揮發。因此電壓梯度1 V/cm 為較佳之操作參數。實驗結果顯示利用分散性奈米鈀/鐵反應牆降解TCE 所產生之亞鐵離子活化過硫酸鹽產生硫酸根自由基進一步氧化受含氯溶劑污染(TCE)的地下水是可行的技術，其對TCE降解效果可達100%。
關鍵詞：分散性、過硫酸鹽、三氯乙烯、電解、奈米鈀/鐵顆粒

關鍵字

分散性 ； 過硫酸鹽 ； 三氯乙烯 ； 電解 ； 奈米鈀/鐵顆粒

並列摘要

In this study, electrolysis-enhanced dispersed permeable reactive barrier (PRB) packed with nano-scale palladium/iron (Pd/Fe) bimetallic particles coupling with persulfate were used to degrade trichlorethylene (TCE) in water The experiments were performed within a sand box. The experimental procedures were divided into five parts as follows: (1) characterization of nano-sacle Fe, nano-scale Pd/Fe, and dispersed nano-scale Pd/Fe, (2) test water quality analysis and adsorption test of TCE on quartz sand, (3) transport tests in porous media, (4) TCE degradation experiments with electrolysis- enhanced PRB packed with nano-sacle dispersed Pd/Fe, (5) TCE degradation experiments with electrolysis-enhanced PRB packed with nano-sacle dispersed Pd/Fe coupling with persulfate.

The average specific surface area of dispersed nano-sized Pd/Fe (1:1000) particles was 167 m2/g. X-ray diffraction (XRD) analysis showed that the nano-sacle Pd/Fe particles had peaks at 2θ = 44.980 and 650 identified for Fe and 2θ = 27.450 and 31.880 for Pd, respectively. The ethane formed by TCE reduced by Fe was identified on dispered nano-scale Pd/Fe particles with a Fourier Transform Infrared Spectrometry (FTIR).
TCE reduction using dispersed nano-sized Pd/Fe particles showed an increase in pH values and a decline in oxidation-reduction (redox) potential. The formation amount of chloride ions is proportional to the reduction amount of TCE in the reduction process. The persulfate oxidation test showed that the ferrous ions produced by the TCE reduction process with dispersed nano-scale Pd/Fe particles could activate persulfate to form sulfate radical (SO4-･) to further oxidize TCE. For the tests of electrolysis-enhanced PRB, the potential gradient set at 2 V/cm was better for TCE degradation than 1 V/cm. As the potential gradient was set at 2 V/cm, some phenomena were observed such as precipitates within the PRB and TCE evaporation by enormous amount of bubbles owing to the heat production. Therefore, the potential gradient 1 V/cm is the optimal parameter for following electrolysis tests. The results showed that TCE degradation by the treatment train of electrolysis-enhanced dispersed permeable reactive barrier (PRB) packed with nano-scale palladium/iron (Pd/Fe) bimetallic particles coupling with persulfate is feasible for remediation of groundwater contaminated by chlorinated solvents.
Keywords: dispersion, persulfate, trichlorethylene, electrolysis,

並列關鍵字

dispersion ； persulfate ； trichlorethylene ； electrolysis ； nano Pd/Fe particles

參考文獻

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